Description: media: dvb-core: Fix kernel WARNING for blocking operation in wait_event*()
References:
 https://lore.kernel.org/all/CA+UBctCu7fXn4q41O_3=id1+OdyQ85tZY1x+TkT-6OVBL6KAUw@mail.gmail.com/
Notes:
 bwh> Introduced in 4.18 by commit 76d81243a487 "media: dvb_frontend:
 bwh> fix locking issues at dvb_frontend_get_event()".
Bugs:
upstream: released (6.4-rc3) [b8c75e4a1b325ea0a9433fa8834be97b5836b946]
6.1-upstream-stable: released (6.1.33) [d0088ea444e676a0c75551efe183bee4a3d2cfc8]
5.10-upstream-stable: released (5.10.183) [ca2d171fd1f3ea03198b8775443d2767301dce9b]
4.19-upstream-stable: released (4.19.285) [f3b5442184a0dab5cee9b2682f947393569e24b2]
sid: released (6.3.7-1)
6.1-bookworm-security: released (6.1.37-1)
5.10-bullseye-security: released (5.10.191-1)
4.19-buster-security: released (4.19.289-1)